#!/bin/sh # 6to4.sh - IPv6-in-IPv4 tunnel backend # Copyright (c) 2010-2012 OpenWrt.org [ -n "$INCLUDE_ONLY" ] || { . /lib/functions.sh . /lib/functions/network.sh . ../netifd-proto.sh init_proto "$@" } find_6to4_prefix() { local ip4="$1" local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS" printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4 } test_6to4_rfc1918() { local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS" [ $1 -eq 10 ] && return 0 [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0 [ $1 -eq 172 ] && [ $2 -ge 16 ] && [ $2 -le 31 ] && return 0 # RFC 6598 [ $1 -eq 100 ] && [ $2 -ge 64 ] && [ $2 -le 127 ] && return 0 return 1 } proto_6to4_setup() { local cfg="$1" local iface="$2" local link="6to4-$cfg" local mtu ttl ipaddr json_get_vars mtu ttl ipaddr ( proto_add_host_dependency "$cfg" 0.0.0.0 ) local wanif if ! network_find_wan wanif; then proto_notify_error "$cfg" "NO_WAN_LINK" return fi [ -z "$ipaddr" ] && { if ! network_get_ipaddr ipaddr "$wanif"; then proto_notify_error "$cfg" "NO_WAN_ADDRESS" return fi } test_6to4_rfc1918 "$ipaddr" && { proto_notify_error "$cfg" "INVALID_LOCAL_ADDRESS" return } # find our local prefix local prefix6=$(find_6to4_prefix "$ipaddr") local local6="$prefix6::1" proto_init_update "$link" 1 proto_add_ipv6_address "$local6" 16 proto_add_ipv6_prefix "$prefix6::/48" proto_add_ipv6_route "::" 0 "::192.88.99.1" proto_add_tunnel json_add_string mode sit json_add_int mtu "${mtu:-1280}" json_add_int ttl "${ttl:-64}" json_add_string local "$ipaddr" proto_close_tunnel proto_send_update "$cfg" } proto_6to4_teardown() { local cfg="$1" } proto_6to4_init_config() { no_device=1 available=1 proto_config_add_string "ipaddr" proto_config_add_int "mtu" proto_config_add_int "ttl" } [ -n "$INCLUDE_ONLY" ] || { add_protocol 6to4 }